Q. When a crystal of potassium permagnet is placed at the bottom of a beaker, filled with water, the whole water turns into purple without stirring. This is an example of -
1) Diffusion
2) Distribution
3) Effusion
4) Intrusion
Q. During summer days, water kept in an earthen pot (pitcher) becomes cool because of -
1) Osmosis
2) Evaporation
3) Diffusion
4) Transpiration
Q. Which of the following is/are physical changes?
I. Condensation of steam
II. Burning of charcoal
III. Making a fruit salad from raw fruits
IV. Melting of wax Correct code is -
1) Only I, and II
2) Only III, and IV
3) Only I, III, and IV
4) All I, II, III, IV
Q. Which of the following is/ are examples of doing work against gravity?
1) Lifting a baby from the floor
2) Lifting the weights by weightlifter
3) Moving of the electric elivator with 4 men, upward
4) All of the above
Q. Which keeps the earth in a uniform circular motion around the sun?
1) The gravitational force between the sun and the moon
2) The gravitational force between the sun and the earth
3) The gravitational force between the Earth and the Mars
4) None of the above
Q. The bandwidth required for commercial telephonic communication (speech signals) is -
1) 300 MHz
2) 30 kHz
3) 4.2 MHz
4) 2800 Hz
Q. To hear a distinct echo, the time interval between the original sound and the reflected one must be at least -
1) 0.01 s
2) 0.1 s
3) 1.0s
4) 10 s
Q. Which of the following slows down the reaction rate?
1) Heterogeneous catalyst
2) Homogeneous catalyst
3) Catalytic promoter
4) None of the above
Q. Current density is -
1) dimensionless
2) a vector quantity
3) a scalar quantity
4) None of the above
Q. An AC current can be produced by -
1) transformer
2) dynamo
3) choke coil
4) None of the above
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